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Diffstat (limited to 'src/third_party/boost-1.56.0/boost/random/exponential_distribution.hpp')
-rw-r--r-- | src/third_party/boost-1.56.0/boost/random/exponential_distribution.hpp | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/src/third_party/boost-1.56.0/boost/random/exponential_distribution.hpp b/src/third_party/boost-1.56.0/boost/random/exponential_distribution.hpp deleted file mode 100644 index 53eaa93865a..00000000000 --- a/src/third_party/boost-1.56.0/boost/random/exponential_distribution.hpp +++ /dev/null @@ -1,182 +0,0 @@ -/* boost random/exponential_distribution.hpp header file - * - * Copyright Jens Maurer 2000-2001 - * Copyright Steven Watanabe 2011 - * Distributed under the Boost Software License, Version 1.0. (See - * accompanying file LICENSE_1_0.txt or copy at - * http://www.boost.org/LICENSE_1_0.txt) - * - * See http://www.boost.org for most recent version including documentation. - * - * $Id$ - * - * Revision history - * 2001-02-18 moved to individual header files - */ - -#ifndef BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP -#define BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP - -#include <boost/config/no_tr1/cmath.hpp> -#include <iosfwd> -#include <boost/assert.hpp> -#include <boost/limits.hpp> -#include <boost/random/detail/config.hpp> -#include <boost/random/detail/operators.hpp> -#include <boost/random/uniform_01.hpp> - -namespace boost { -namespace random { - -/** - * The exponential distribution is a model of \random_distribution with - * a single parameter lambda. - * - * It has \f$\displaystyle p(x) = \lambda e^{-\lambda x}\f$ - */ -template<class RealType = double> -class exponential_distribution -{ -public: - typedef RealType input_type; - typedef RealType result_type; - - class param_type - { - public: - - typedef exponential_distribution distribution_type; - - /** - * Constructs parameters with a given lambda. - * - * Requires: lambda > 0 - */ - param_type(RealType lambda_arg = RealType(1.0)) - : _lambda(lambda_arg) { BOOST_ASSERT(_lambda > RealType(0)); } - - /** Returns the lambda parameter of the distribution. */ - RealType lambda() const { return _lambda; } - - /** Writes the parameters to a @c std::ostream. */ - BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR(os, param_type, parm) - { - os << parm._lambda; - return os; - } - - /** Reads the parameters from a @c std::istream. */ - BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR(is, param_type, parm) - { - is >> parm._lambda; - return is; - } - - /** Returns true if the two sets of parameters are equal. */ - BOOST_RANDOM_DETAIL_EQUALITY_OPERATOR(param_type, lhs, rhs) - { return lhs._lambda == rhs._lambda; } - - /** Returns true if the two sets of parameters are different. */ - BOOST_RANDOM_DETAIL_INEQUALITY_OPERATOR(param_type) - - private: - RealType _lambda; - }; - - /** - * Constructs an exponential_distribution with a given lambda. - * - * Requires: lambda > 0 - */ - explicit exponential_distribution(RealType lambda_arg = RealType(1.0)) - : _lambda(lambda_arg) { BOOST_ASSERT(_lambda > RealType(0)); } - - /** - * Constructs an exponential_distribution from its parameters - */ - explicit exponential_distribution(const param_type& parm) - : _lambda(parm.lambda()) {} - - // compiler-generated copy ctor and assignment operator are fine - - /** Returns the lambda parameter of the distribution. */ - RealType lambda() const { return _lambda; } - - /** Returns the smallest value that the distribution can produce. */ - RealType min BOOST_PREVENT_MACRO_SUBSTITUTION () const - { return RealType(0); } - /** Returns the largest value that the distribution can produce. */ - RealType max BOOST_PREVENT_MACRO_SUBSTITUTION () const - { return (std::numeric_limits<RealType>::infinity)(); } - - /** Returns the parameters of the distribution. */ - param_type param() const { return param_type(_lambda); } - /** Sets the parameters of the distribution. */ - void param(const param_type& parm) { _lambda = parm.lambda(); } - - /** - * Effects: Subsequent uses of the distribution do not depend - * on values produced by any engine prior to invoking reset. - */ - void reset() { } - - /** - * Returns a random variate distributed according to the - * exponential distribution. - */ - template<class Engine> - result_type operator()(Engine& eng) const - { - using std::log; - return -result_type(1) / - _lambda * log(result_type(1)-uniform_01<RealType>()(eng)); - } - - /** - * Returns a random variate distributed according to the exponential - * distribution with parameters specified by param. - */ - template<class Engine> - result_type operator()(Engine& eng, const param_type& parm) const - { - return exponential_distribution(parm)(eng); - } - - /** Writes the distribution to a std::ostream. */ - BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR(os, exponential_distribution, ed) - { - os << ed._lambda; - return os; - } - - /** Reads the distribution from a std::istream. */ - BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR(is, exponential_distribution, ed) - { - is >> ed._lambda; - return is; - } - - /** - * Returns true iff the two distributions will produce identical - * sequences of values given equal generators. - */ - BOOST_RANDOM_DETAIL_EQUALITY_OPERATOR(exponential_distribution, lhs, rhs) - { return lhs._lambda == rhs._lambda; } - - /** - * Returns true iff the two distributions will produce different - * sequences of values given equal generators. - */ - BOOST_RANDOM_DETAIL_INEQUALITY_OPERATOR(exponential_distribution) - -private: - result_type _lambda; -}; - -} // namespace random - -using random::exponential_distribution; - -} // namespace boost - -#endif // BOOST_RANDOM_EXPONENTIAL_DISTRIBUTION_HPP |